The Craft Identification Number (CIN) or Hull Identification Number (HIN), standardised as EN ISO 10087:2006, is a permanent unique fourteen-digit alphanumeric identifier issued to all marine vessels in Europe.
Larger vessels over 300 gross tonnage also receive a permanent international IMO ship identification number, and European vessels over 20 metres receive a permanent ENI number.
An example CID/HID might appear as "GB-ABC00042-A3-99", where "GB" is the ISO 3166-1 country code, "ABC" would be the Acme Boat Company's Manufacturer Identity Code (MIC); "00042" would be the forty-second hull constructed by the organisation; "A3" would be January 2013 for the date keel was laid to the nearest month and "99" denoted as the year 1999 as the particular model/specification number.
In the United Kingdom, the British Marine Federation manage the issuing of Manufacturer Identity Code on behalf of the British Department for Business Innovation and Skills.
[1] Amateur boat builders in the United Kingdom may apply for one-off HIN from the Royal Yacht Association who will issue one number from their "GB-RYAxxxxx" range.